I own a 2015 PP Mustang GT, and I'm trying to find replacement tires for it. I really wanted to Nitto NT555 extreme summer performance tires for it, because I had an incredible experience with them when I owned them on my 2012 GT. They had great all around traction and great tread life (they lasted nearly 60k miles). The issue I'm running into is that Nitto does not make them in the 275/40/19 and 255/40/19 size that the 15' PP GT requires.

Can I get away with running 275/35/19 in the rear and 245/35/19 in the front? What is the worse case scenario with going with these tires?

What tires (size and brand) would you guys recommend that also have great tread life and great traction?

 

Nitto 555 gen2. They come in 255/40 and 275/40. I'm surprised you were impressed with the originals. They weren't all that impressive to me and got loud as they aged. I am interested to see the gen2 though. You might also consider the Invos and the NT05s. Michelin Pilot Sport A/S 3s are another good one, but more expensive.